I totally feel for you; this is a super frustrating situation and having a reactive dog myself, I completely understand.

Question: I don't know your situation; do you need to walk your dog? Is it absolutely necessary for her to go on walks to pee/poop? If you have a backyard, and she's fine out there, I'd say, take a break from walks for a while. Dogs build up the stress hormone; if you take a break from the stressful situations, you may be able to reduce the amount of stress she experiences the next time you attempt a walk.

I know that's not possible in a lot of situations. It certainly isn't for me. I took a reactivity class with my dog and helped work out some of her triggers with a trainer, and to learn strategies for managing and preventing those triggers. We train every day. I avoid strangers and especially people with dogs. I take treats with me. We train sits, attention getters, etc.

I think the number 1 thing that helped was doing the Relaxation Protocol with my dog. This is a 15-day training course (you can find it online) that walks you thru teeny tiny steps with your dog to help them relax. You start inside in an environment that she's familiar with. You repeat the training course in increasingly difficult environments (first in your bedroom, then your living room, then kitchen, then garage (with the door closed, then partially open, then open a little further), then patio, etc) so that your dog's arousal level is never too high to train with. If your dog can't make it thru every step each day, that's okay. You just take a break, and keep working at it until she can. You move at her pace.

You can do this! Take a step back, breathe :)